Inverse Problem Approach for the Alignment of Electron Tomographic Series.

Abstract : In the refining industry, morphological measurements of particles have become an essential part in the characterization catalyst supports. Through these parameters, one can infer the specific physicochemical properties of the studied materials. One of the main acquisition techniques is electron tomography (or nanotomography). 3D volumes are reconstructed from sets of projections from different angles made by a Transmission Electron Microscope (TEM). This technique provides a real three-dimensional information at the nanometric scale. A major issue in this method is the misalignment of the projections that contributes to the reconstruction. The current alignment techniques usually employ fiducial markers such as gold particles for a correct alignment of the images. When the use of markers is not possible, the correlation between adjacent projections is used to align them. However, this method sometimes fails. In this paper, we propose a new method based on the inverse problem approach where a certain criterion is minimized using a variant of the Nelder and Mead simplex algorithm. The proposed approach is composed of two steps. The first step consists of an initial alignment process, which relies on the minimization of a cost function based on robust statistics measuring the similarity of a projection to its previous projections in the series. It reduces strong shifts resulting from the acquisition between successive projections. In the second step, the pre-registered projections are used to initialize an iterative alignment-refinement process which alternates between (i) volume reconstructions and (ii) registrations of measured projections onto simulated projections computed from the volume reconstructed in (i). At the end of this process, we have a correct reconstruction of the volume, the projections being correctly aligned. Our method is tested on simulated data and shown to estimate accurately the translation, rotation and scale of arbitrary transforms. We have successfully tested our method with real projections of different catalyst supports.
Type de document :
Article dans une revue
Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 2014, 69 (2), pp. 279-291. 〈10.2516/ogst/2013116〉
Liste complète des métadonnées

Littérature citée [15 références]  Voir  Masquer  Télécharger

https://hal-ifp.archives-ouvertes.fr/hal-00992251
Contributeur : Françoise Bertrand <>
Soumis le : vendredi 16 mai 2014 - 15:59:00
Dernière modification le : mercredi 25 juillet 2018 - 14:05:32
Document(s) archivé(s) le : lundi 10 avril 2017 - 23:26:15

Fichier

A9RB63A.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Citation

Viet Dung Tran, Maxime Moreaud, Éric Thiébaut, L. Denis, Jean-Marie Becker. Inverse Problem Approach for the Alignment of Electron Tomographic Series.. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 2014, 69 (2), pp. 279-291. 〈10.2516/ogst/2013116〉. 〈hal-00992251〉

Partager

Métriques

Consultations de la notice

1513

Téléchargements de fichiers

303